/*

 * jcomapi.c

 *

 * Copyright (C) 1994-1997, Thomas G. Lane.

 * Modified 2019 by Guido Vollbeding.

 * This file is part of the Independent JPEG Group's software.

 * For conditions of distribution and use, see the accompanying README file.

 *

 * This file contains application interface routines that are used for both

 * compression and decompression.

 */

#define JPEG_INTERNALS

#include "jinclude.h"

#include "jpeglib.h"

/*

 * Abort processing of a JPEG compression or decompression operation,

 * but don't destroy the object itself.

 *

 * For this, we merely clean up all the nonpermanent memory pools.

 * Note that temp files (virtual arrays) are not allowed to belong to

 * the permanent pool, so we will be able to close all temp files here.

 * Closing a data source or destination, if necessary, is the application's

 * responsibility.

 */

GLOBAL(void)

jpeg_abort (j_common_ptr cinfo)

{

  int pool;

  /* Do nothing if called on a not-initialized or destroyed JPEG object. */

  if (cinfo->mem == NULL)

    return;

  /* Releasing pools in reverse order might help avoid fragmentation

   * with some (brain-damaged) malloc libraries.

   */

  for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {

    (*cinfo->mem->free_pool) (cinfo, pool);

  }

  /* Reset overall state for possible reuse of object */

  if (cinfo->is_decompressor) {

    cinfo->global_state = DSTATE_START;

    /* Try to keep application from accessing now-deleted marker list.

     * A bit kludgy to do it here, but this is the most central place.

     */

    ((j_decompress_ptr) cinfo)->marker_list = NULL;

  } else {

    cinfo->global_state = CSTATE_START;

  }

}

/*

 * Destruction of a JPEG object.

 *

 * Everything gets deallocated except the master jpeg_compress_struct itself

 * and the error manager struct.  Both of these are supplied by the application

 * and must be freed, if necessary, by the application.  (Often they are on

 * the stack and so don't need to be freed anyway.)

 * Closing a data source or destination, if necessary, is the application's

 * responsibility.

 */

GLOBAL(void)

jpeg_destroy (j_common_ptr cinfo)

{

  /* We need only tell the memory manager to release everything. */

  /* NB: mem pointer is NULL if memory mgr failed to initialize. */

  if (cinfo->mem != NULL)

    (*cinfo->mem->self_destruct) (cinfo);

  cinfo->mem = NULL;    /* be safe if jpeg_destroy is called twice */

  cinfo->global_state = 0;  /* mark it destroyed */

}

/*

 * Convenience routines for allocating quantization and Huffman tables.

 * (Would jutils.c be a more reasonable place to put these?)

 */

GLOBAL(JQUANT_TBL *)

jpeg_alloc_quant_table (j_common_ptr cinfo)

{

  JQUANT_TBL *tbl;

  tbl = (JQUANT_TBL *)

    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));

  tbl->sent_table = FALSE;  /* make sure this is false in any new table */

  return tbl;

}

GLOBAL(JHUFF_TBL *)

jpeg_alloc_huff_table (j_common_ptr cinfo)

{

  JHUFF_TBL *tbl;

  tbl = (JHUFF_TBL *)

    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));

  tbl->sent_table = FALSE;  /* make sure this is false in any new table */

  return tbl;

}

/*

 * Set up the standard Huffman tables (cf. JPEG standard section K.3).

 * IMPORTANT: these are only valid for 8-bit data precision!

 * (Would jutils.c be a more reasonable place to put this?)

 */

GLOBAL(JHUFF_TBL *)

jpeg_std_huff_table (j_common_ptr cinfo, boolean isDC, int tblno)

{

  JHUFF_TBL **htblptr, *htbl;

  const UINT8 *bits, *val;

  int nsymbols, len;

  static const UINT8 bits_dc_luminance[17] =

    { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };

  static const UINT8 val_dc_luminance[] =

    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  static const UINT8 bits_dc_chrominance[17] =

    { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };

  static const UINT8 val_dc_chrominance[] =

    { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

  static const UINT8 bits_ac_luminance[17] =

    { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };

  static const UINT8 val_ac_luminance[] =

    { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,

      0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,

      0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,

      0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,

      0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,

      0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,

      0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,

      0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,

      0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,

      0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,

      0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,

      0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,

      0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

      0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,

      0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,

      0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,

      0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,

      0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,

      0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,

      0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

      0xf9, 0xfa };

  static const UINT8 bits_ac_chrominance[17] =

    { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };

  static const UINT8 val_ac_chrominance[] =

    { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,

      0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,

      0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,

      0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,

      0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,

      0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,

      0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,

      0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,

      0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,

      0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,

      0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,

      0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

      0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,

      0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,

      0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,

      0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,

      0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,

      0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,

      0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,

      0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,

      0xf9, 0xfa };

  if (cinfo->is_decompressor) {

    if (isDC)

      htblptr = ((j_decompress_ptr) cinfo)->dc_huff_tbl_ptrs;

    else

      htblptr = ((j_decompress_ptr) cinfo)->ac_huff_tbl_ptrs;

  } else {

    if (isDC)

      htblptr = ((j_compress_ptr) cinfo)->dc_huff_tbl_ptrs;

    else

      htblptr = ((j_compress_ptr) cinfo)->ac_huff_tbl_ptrs;

  }

  switch (tblno) {

  case 0:

    if (isDC) {

      bits = bits_dc_luminance;

      val = val_dc_luminance;

    } else {

      bits = bits_ac_luminance;

      val = val_ac_luminance;

    }

    break;

  case 1:

    if (isDC) {

      bits = bits_dc_chrominance;

      val = val_dc_chrominance;

    } else {

      bits = bits_ac_chrominance;

      val = val_ac_chrominance;

    }

    break;

  default:

    ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tblno);

    return NULL; /* avoid compiler warnings for uninitialized variables */

  }

  if (htblptr[tblno] == NULL)

    htblptr[tblno] = jpeg_alloc_huff_table(cinfo);

  htbl = htblptr[tblno];

  /* Copy the number-of-symbols-of-each-code-length counts */

  MEMCOPY(htbl->bits, bits, SIZEOF(htbl->bits));

  /* Validate the counts.  We do this here mainly so we can copy the right

   * number of symbols from the val[] array, without risking marching off

   * the end of memory.  jxhuff.c will do a more thorough test later.

   */

  nsymbols = 0;

  for (len = 1; len <= 16; len++)

    nsymbols += bits[len];

  if (nsymbols > 256)

    ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);

  if (nsymbols > 0)

    MEMCOPY(htbl->huffval, val, nsymbols * SIZEOF(UINT8));

  /* Initialize sent_table FALSE so table will be written to JPEG file. */

  htbl->sent_table = FALSE;

  return htbl;

}